Model Development and Support CalSim Model Logic

The Bureau of Reclamation is seeking vendors to provide support, maintenance, and development services for CalSim 3, a water resource modeling platform used to analyze Central Valley Project (CVP) and State Water Project (SWP) operations. This is a Sources Sought notice for market research purposes and does not constitute a formal solicitation or obligate the government to award a contract. Interested vendors must demonstrate experience with CalSim 3 or similar water resource modeling platforms, support and maintenance of complex modeling systems, and development and enhancement of modeling tools for water operations. Vendors should submit capability statements that include business information, size and socio-economic status, and relevant past performance examples. The response deadline is Wednesday, January 28, 2026, at 1:00 PM Pacific Time, with all questions and submissions directed to RaShayla Brown at rbrown@usbr.gov. The opportunity is classified under NAICS Code 541690 (Other Scientific and Technical Consulting Services) with a size standard of $19.0 million.

This procurement includes no set-aside designations. The contract is structured as a Time and Materials service agreement with a base year and four option years, spanning from March 1, 2026 to February 28, 2031. Key deliverables include project management, CalSim model development, data management, WRESL code development, post-processing tools, and support for operations and modeling staff. The contractor will be required to provide weekly progress meetings, quarterly reports, and secure digital access to developed models and documentation, with interim materials to be delivered within two business days of request. The scope focuses on examining CVP allocation procedures, implementing flexibility in water project operations, improving model efficiency, redesigning operations logic for specific infrastructure such as Millerton Lake, and enhancing modeling capabilities for water resource management in the Sacramento and San Joaquin Valleys.